[[jackson]]
= Jackson Support

Spring Security provides Jackson support for persisting Spring Security-related classes.
This can improve the performance of serializing Spring Security-related classes when working with distributed sessions (session replication, Spring Session, and so on).

To use it, register the `SecurityJackson2Modules.getModules(ClassLoader)` with `ObjectMapper` (https://github.com/FasterXML/jackson-databind[jackson-databind]):

[source,java]
----
ObjectMapper mapper = new ObjectMapper();
ClassLoader loader = getClass().getClassLoader();
List<Module> modules = SecurityJackson2Modules.getModules(loader);
mapper.registerModules(modules);

// ... use ObjectMapper as normally ...
SecurityContext context = new SecurityContextImpl();
// ...
String json = mapper.writeValueAsString(context);
----

[NOTE]
====
The following Spring Security modules provide Jackson support:

- spring-security-core (javadoc:org.springframework.security.jackson2.CoreJackson2Module[])
- spring-security-web (javadoc:org.springframework.security.web.jackson2.WebJackson2Module[], javadoc:org.springframework.security.web.jackson2.WebServletJackson2Module[], javadoc:org.springframework.security.web.server.jackson2.WebServerJackson2Module[])
- <<oauth2client, spring-security-oauth2-client>> (javadoc:org.springframework.security.oauth2.client.jackson2.OAuth2ClientJackson2Module[])
- spring-security-cas (javadoc:org.springframework.security.cas.jackson2.CasJackson2Module[])
====